Yes, always on the left side, cramps too. Sometimes up near my bellybutton too.

Start doing some Miralax or some linzess from your doctor and get regulated you can take a bowel softener in the morning and one at night as long as it doesn't have a stimulant in it to soften those bowels to get yourself cleaned out because your colon is in the lower left side and you can have pain that goes up to your belly button or all around that area and with constipation it just makes it worse and if you strain and strain then you're going to get diverticulitis which is little pockets in the colon and they can fill up with feces or things with seeds in them or anything and get infected and then you can have severe pain with a fever so get yourself cleaned out try some Miralax for a few days if that doesn't work you can also take the bowel softeners with the Miralax

It sounds like DIVERTICULOSIS, have you had a colonoscopy. Pretty much everyone has this as they age and people are usually not bothered by it.
I on the other hand had issues due to the IBS, when diverticuli get inflamed it causes diverticulitis, anything ending in itis means inflammation of the area. If you have a fever along with the left side pain, call the Dr. They will treat with antibiotics, bowel and bed rest.

Me too

That's how I found out I had IBS. Pain in the left side, so bad that I couldn't walk. Along with a 7 day constipation. After a colonoscopy, I was told I had IBS.